I have a PCI-MIO-16E-4 and a device that sends out one frequency (negative-going 50% duty cycle pulse train) for 0.8 ms, pauses for 0.2 ms, sends out another frequency, pauses for 6.6 ms, then repeats.
I thought the code below would start counting on a negative edge, most likely starting during the longer inter-pulse-train pause, and read out the two frequencies, though it gives an error stating that the frequency of the signal is too low for the duration chosen.
what am I missing?